A plaque marks the spot on the bridge where one of the first elephants in the U.S., Little Bet, was gunned down.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

An architectural oddity hides in plain sight on this iconic London bridge.

The world-record holder for the longest bridge stretching continuously over water.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

This magnificently macabre shield shows the power of chivalrous love in medieval times.

This abandoned factory on the Hudson River once churned out a million bricks a week.

Reforestation in action is the main attraction in this abandoned quarry.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

The sculpture of the deceased cockatoo flops atop its personal plinth.

The largest known open fault in the United States is basically a giant natural refrigerator.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

A working metal shop and venue for outrageous art and music shows in a former cannonball factory.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.

The ballpark in "Pigtown" where the Brooklyn Dodgers made their name was replaced with a huge apartment complex.

19th century cemetery hidden in Brooklyn's Prospect Park.

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

The first pet cemetery in the United States.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."